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Hello all,

 Is any anyone know how good is maple numeric stiff ode solver (stiff=true) ? What i mean is how many stiff ode's it can handle at a given time. I am having a hardtime solving a system of ode's (say 300 stiff ode's). Is there any other numeric stiff ode solver in maple that can handle large number of ode's?

I used islode advanced numeric solver for stiff ode's and it also has some limitations on the number of ode's and moreover it is slow.

What would be the best way to compute the determinant of a very large (millions x millions) 0-1 matrix?

I'm trying to compute the determinant of a 19x19 matrix, each with entries consisting of multivariate polynomials (polys in 6 vars, of degree at most 8).  Specifically I want to factor the determinant.  Running this on Maple 15 quickly gives an "object too large" error in the determinant function, after using only 700 MB of RAM in about 2 minutes.  My machine has 3GB of RAM, so I am confused as to why this object is "too large". 

I...

Regards,

I have a very large equation which has an arctan(x,y). I need to be able to extract the arguments x,y and assign them in some variables.

I have tried the solution given here.

Unfortunately, that solution only works for constants, not equations.

For example, if I use the proc given in there with arctan(10,11) it works. But if I use something like arctan...

Hi,

I have those questions:

1) set

When I write these inputs,

x:={1,3,2}; y:={b,a,d,c}; z:={a[1],a[1,1],b[0],d[0],c[0],a[0],2};

the results are x := {1, 2, 3}, y := {a, b, c, d}, z := {2, a[0], a[1], a[1,1], b[0], c[0], d[0]}

Is there a way to get what I input

2) This problem in ordering numbers and words is verry important and hard when solving a large system of equations with:

restart:with(SolveTools): eqns:=[a[0...

Hi all,

I have a large system of equations in matrix form A x = b (A and b are constituated with numbers)

The rank of the matrice A is 1524 by 1524

How to solve numerically the system with maple. I searched in maple help and mapleprimes questions but I have not got answer.

If maple has a limitation in solving large system of equation numerically,

Is it possible to export the matrices A and b in matlab and solve the system in matlab and...

Hi e-friends,

I want to minimize a function subject to a set of S restrictions.

The restrictions are related to matrices V, W, X and Y:

V = [v1, .., vS]  order L x S

W = [w1, .., wS] order L x S

X = [x1, .., xS]  order LxS

Y = [y11,.. yS] order L x S

How may I write in MAPLE in compact form  the following S inequalities (for any arbitrary integers L and S)?. ...

Hi

My computer has 6 GB RAM and works with Windows Seven 7 (64 bits). When I am running my MAPLE program(Version 12), the MAPLE software needs the large amount of memory. But when the consumed memory exceeds over 2 GB, the CPU and computation  stop. Even if I used the Command {kernelopts(datalimit)}, the software did not allow me to use the memory more than 2097100 KB.

A lot of people want to do very large computations which require a lot of RAM.  But above a certain threshold, the cost of memory explodes.  We had this idea but no excuse to try it.  Buy a good SSD and use it for a swap partition.  I suggest the Intel X25-M.  Make sure you have at least 1/10th of its size in RAM, i.e. 8GB of RAM for an 80GB drive, but of course more is better.  The RAM should act as a massive cache for the SSD, giving you another...